Ansible - Automation for Everyone!
Introduction about Ansible Core
Hideki SaitoSoftware Maintenance Engineer/Tower Support Team2017.06
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Who am I• Hideki Saito <[email protected]>
• Software Maintenance Engineer / Red Hat• Work for Ansible Tower Support Team• I love Ansible, OpenStack and Beer :) • Twitter: @saito_hideki
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Agenda• Ansible Core Introduction• Demo’s
• Let’s play with Ansible Core• Getting Started• Ad-Hoc command• Playbooks
• Ansible Tower by Red Hat
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Motivation and PropositionAutomate routine work to operate IT system.
• Let's start with where we can automate easily.• Let's start automation using script language that
anyone can easily understand.
● Education and training for programming take a lot of time.● The IT system includes various kinds of hardware / software.
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AUTOMATION FOR EVERYONE• Ansible is an IT automation tool• Goals are simplicity and ease-of-use• Managing target via SSH transportation• Management steps is written by YAML• New release is provided approximately
every 2 months
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Introduce following components of Ansible Core:
Ansible CoreAnsible Core is command-line IT automation Tool and libraries
1. Command Line Tools
2. Playbooks
3. Inventory
4. Modules
5. Plugins
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COMMAND LINE TOOLSAnsible Core contains some command line tools. Following 2 commands are able to control your target hosts.
[Usage] ansible %Target% -i %Inventory% -m %Module%$ ansible www -i inventory -m ping
[Usage] ansible %Target% -i %Inventory% -a %Ad-Hoc Command%$ ansible www -i inventory -a “/sbin/reboot”
[Usage] ansible %Target% -i %Inventory% -m %Module%$ ansible www -i inventory -m ping
[Usage] ansible %Target% -i %Inventory% -a %Ad-Hoc Command%$ ansible www -i inventory -a “/sbin/reboot”
[Usage] ansible-playbook -i %Inventory% %Playbook%$ ansible-playbook -i inventory playbook.yml[Usage] ansible-playbook -i %Inventory% %Playbook%$ ansible-playbook -i inventory playbook.yml
1. ansible command
2. ansible-playbook command
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COMMAND MECHANISM
Target Hostmodule
Inventory
ExecutablePython Code
ExecutablePython CodeExecutable
Python Code
ansible
(1)
(2)
(3)
(4)
(5)
(1) Lookup Target Host(2) Read Module(3) Generate executable code from Module(4) Copy Executable python code to via SCP(5) Execute python code on Target Host
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PLAYBOOKSPlaybooks are Ansible’s configuration, deployment, and orchestration language. You can write Playbooks easily by YAML.
01: ---02: - hosts: www03: vars:04: new_name: ansible-host105: tasks:06: - name: get hostname07: shell: hostname08: register: result09: - name: set hostname10: hostname:11: name: "{{ new_name }}"12: notify: show hostname13: handlers:14: - name: show hostname15: debug:16: msg: "before={{ result.stdout }} after={{ new_name }}"
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INVENTORY (STATIC)Ansible is able to working against multiple system at the same time.
You can select portions of systems listed in the inventory at running time.
01: [localhost]02: 127.0.0.103:04: [staging]05: 192.168.0.106: 192.168.0.207:08: [production]09: www1.example.com10: www2.example.com11:12: [vars:local]13: ansible_connection=local
01: [localhost]02: 127.0.0.103:04: [staging]05: 192.168.0.106: 192.168.0.207:08: [production]09: www1.example.com10: www2.example.com11:12: [vars:local]13: ansible_connection=local
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INVENTORY (DYNAMIC)Ansible easily supports all of these options via an external inventory system.
For example: OpenStack, AWS, GCE or something like that.
You can look these dynamic inventories at https://goo.gl/knXn3c
ansible
ExecutableInventory Code
JSON formattedInventory Infovia STDOUT
OpenStack
(1)(2)
(3)
(4)
(1) Execute Dynamic Inventory(2) Collect Target information(3) Output Inventory to STDOUT(4) Read Inventory Information
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MODULES (1)Ansible has a lot of modules that can be executed directly on remote hosts or through Playbooks. You can see module index at https://goo.gl/yCGC4U
Group Target
Cloud AWS, GCE, Azure, OpenStack etc...
Clustering
Commands
Crypto
Database
Group Target
CloudAWS, GCE, Azure, OpenStack etc...
Clustering K8S, Pacemaker etc...
Commands command, shell, expect etc...
Crypto openssl
Database MySQL, PostgreSQL, MSSQL etc ...
Group Target
Cloud AWS, GCE, Azure, OpenStack etc...
Clustering
Commands
Crypto
Database
Group Target
Filefile, template, stat,
unarchive etc...
Identity FreeIPA, OpenDJ
Inventory Add group and host to inventory
Messaging RabbitMQ
Monitoring datadog, logstash, nagios etc...
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MODULES (2)Group Target
Net Tools haproxy, nmcli, ldap, get_url etc...
Network Bigswitch, Cumulus, Eos, IOS. Junos etc ...
Notification hipcat, irc, slack etc...
Packaging rpm, yum, npm, apt etc...
Remote management HP iLO, IPMI etc...
Source control git, github, gitlab, hg, subversion etc ...
Group Target
Storage NetApp, zfs etc...
Systemuser, group, service,
puppet :) etc...
Utilities Helper, Logic
Web infrastructure apache, nginx, tower etc...
Windows IIS, acl, package etc...
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PLUGINSPlugins are pieces of code that augment Ansible’s core functionality.
You can easily write your own. Please see: https://goo.gl/ZQ9hvb
For example: connection plugin~ https://goo.gl/rLha4L ~
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Simple can be harder than complex. You have to work hard to get your thinking clean to make it simple.
But it’s worth it in the end because once you get there, you can move mountains.
~ Steve Jobs ~
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How do we link a lot of system with each other?
Beyond the CoreWhat should we do the next-step?
Building an IT automation process as simple as possible. But ANSIBLE Core does not provide enough functions to advance IT automation to the next step. It does not provide API based control mechanism.
APICLI
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Introduce following Tower functions:
Ansible Tower by Red HatAnsible Tower is a web-based solution that is It’s designed to be the hub for all of your automation tasks.
1. Overview
2. Job Template / Work-flow /Callback
3. Web based Dashboard
4. RESTful API
5. Isolation, Consolidation and Cooperation
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Tower#0
Ansible Tower - Architecture DesignWhat’s the Ansible Tower
Web Browser
Tower service
Database
AMQP broker
AMQP worker
Tower#1
Tower service
AMQP broker
AMQP worker
Tower#2
Tower service
AMQP broker
AMQP worker
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Execute Job/Workflow/CallbackAnsible Tower runs a playbook as a Job.
● Job Template● Jobs can be run periodically.
● Workflow● Jobs can combine as a workflow
● Callback URL● Jobs can launch from Target via
callback url
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RESTful APIYou can manage Tower server via RESTful API
If you want to manage Tower from other external IT system, you can use API!
● Access https://tower/api/v1/● Manage Tower settings● Launch Job template● etc..
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Isolation, Consolidation and Cooperation
Isolation of authority, consolidation management, and using external systems.
● Role Based Access Control● Organization, Project, User, Team
● Integrates with LDAP, AD, and other IAM● Logging aggregation with other system● Job isolation via namespace and chroots● etc...
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If you want to proceed to the next step,
I believe Ansible Core and Tower will help you.